OCR A Chemistry F324 Rings, Polymers and Analysis Thu 26 Jan 2012

Do we need to know the molecules needed to produce terylene/polylactic acid/nylon-6,6/kevlar?
Also what are the reagents for producing polyamides?

Enlighten us with your knowledge then !

Well Guess wot people 's in the january exam f321 they asked a question regarding something that was not on the spec so they could ask a question on NMR or maybe not there trying to make the exams more difficult i herd more application of knowlegde Questions this Year

Well Guess wot people 's in the january exam f321 they asked a question regarding something that was not on the spec so they could ask a question on NMR or maybe not there trying to make the exams more difficult i herd more application of knowlegde Questions this Year

No if they ask a question they have to give us the monomers or the structure.

Conditions are not specified for producing polyamides I don't think

Do we need to know the molecules needed to produce terylene/polylactic acid/nylon-6,6/kevlar?
Also what are the reagents for producing polyamides?

Does everyone know the 3 stages of mass spec?

I would challenge that with yes you do need to know the monomers, BUT I'm not sure whether that was just my teacher trying to get us learning stuff around the spec. and not to rely too heavily on what the exam board may or may not provide.

Also, it's definitely too late, but https://sites.google.com/site/mathslab9000/home/chemistry/f324---rings-polymers-and-analysis my notes are on there.

Terylene: Is a polyester
Reaction is: ethan-1,2-diol + benzen-1,4-dioic acid
All you need to know that it eliminates water to form Terylene.

Polylactic acid: polyester
Reaction: made from the same monomer Lactic acid (2-hydroxypropanoic acid)

Nylon-6,6: polyamide
Reaction: 1,6-diaminohexane + hexa-1,4-dioic acid

Kevlar: polyamide
Reaction: benzen-1,4-dioic acid + benzen-1,4-diamine

Again both polyamides take part in condensation polymerisation so water is eliminated from the monomers to produce the polymer

Thats all you really need to know, you dont even really need to know the monomers they usually give them you

No what are they

If not spin-spin coupled, then a proton has a tiny wee pole that when put under a magnetic field will align with it. They then fire off the radiowaves, which cause the poles to 'flip' As they decay back into the ground state (aligned with the magnetic field) they emit the absorbed radiation. It is the time taken for the decay that is measured. The work I did was more aimed at the human MRI, but I know in that there are multiple gradients which can be taken to give different images.

Something along those lines. But like has been said, we don't need to know this, and thank god, because I'm sure as hell my explanation is crappy!

ionisation of compounds, then acceleration, then deflection of compounds, the more they are deflected the lighter they are, this allows you to work out the mass of the particles. This is then analysed by a computer which plots a graph of intensities of peaks at different deflection points which allows you to work out the ions of the compound.

I have to admit, they are very good notes

And all compounds have discrete fragmentation patterns which can be compared to a spectral database to identify. :F

A little thing that my teacher said that I've not been able to forget no matter how hard is terylene is a polyEster due to the high numbers of e's (and e suonds) in the name.

Also, not for polyamides, but when defining a condensation reaction, remember (not directly at you Hullaboo! Just in general) it's a small molecule not just H20 (HCl for example)